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首页> 外文期刊>Materials >Highly Efficient Composite Flame Retardants for Improving the Flame Retardancy, Thermal Stability, Smoke Suppression, and Mechanical Properties of EVA
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Highly Efficient Composite Flame Retardants for Improving the Flame Retardancy, Thermal Stability, Smoke Suppression, and Mechanical Properties of EVA

机译：高效的复合阻燃剂，用于改善阻燃性，热稳定性，烟雾抑制和EVA的机械性能

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Ethylene vinyl acetate (EVA) copolymer has been used extensively in many fields. However, EVA is flammable and releases CO gas during burning. In this work, a composite flame retardant with ammonium polyphosphate (APP), a charring–foaming agent (CFA), and a layered double hydroxide (LDH) containing rare-earth elements (REEs) was obtained and used to improve the flame retardancy, thermal stability, and smoke suppression for an EVA matrix. The thermal analysis showed that the maximum thermal degradation temperature of all composites increased by more than 37 °C compared with that of pure EVA. S-LaMgAl/APP/CFA/EVA, S-CeMgAl/APP/CFA/EVA, and S-NdMgAl/APP/CFA/EVA could achieve self-extinguishing behavior according to the UL-94 tests (V-0 rating). The peak heat release rate (pk-HRR) indicated that all LDHs containing REEs obviously reduced the fire strength in comparison with S-MgAl. In particular, pk-HRR of S-LaMgAl/APP/CFA/EVA, S-CeMgAl/APP/CFA/EVA and S-NdMgAl/APP/CFA/EVA were all decreased by more than 82% in comparison with pure EVA. Furthermore, the total heat release (THR), smoke production rate (SPR), and production rate of CO (COP) also decreased significantly. The average mass loss rate (AMLR) confirmed that the flame retardant exerted an effect in the condensed phase of the composites. Meanwhile, the combination of APP, CFA, and LDH containing REEs allowed the EVA matrix to maintain good mechanical properties.
机译：乙烯乙酸乙烯酯（EVA）共聚物已在许多领域广泛使用。然而，EVA在燃烧过程中是易燃和释放CO气体。在这项工作中，获得了用氨基磷酸铵（APP），炭状发泡剂（CFA），含有稀土元素（REES）的含有稀土元素（REES）的复合阻燃剂并用于改善阻燃性，热稳定性，以及EVA矩阵的烟雾抑制。热分析表明，与纯EVA相比，所有复合材料的最大热降解温度增加了37℃。 S-Lamgal / App / CFA / EVA，S-CEMGAL / APP / CFA / EVA和S-NDMGAL / APP / CFA / EVA可根据UL-94测试（V-0 Rating）实现自灭火行为。峰热释放速率（PK-HRR）表明，与S-MGAL相比，含有RDE的所有LDH都明显降低了火强度。特别地，与纯EVA相比，S-ampGal / APP / EVA，S-CEMGAL / APP / CFA / EVA和S-NDMGAL / APP / CFA / EVA和S-NDMGAL / APP / CFA / EVA的PK-HRR均降低了82％以上。此外，总热释放（Thr），烟雾生产率（SPR）和CO（COP）的生产率也显着下降。平均质量损失率（AMLR）证实阻燃剂在复合材料的冷凝相中发出了效果。同时，含有REES的APP，CFA和LDH的组合允许EVA基质保持良好的机械性能。

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